摘要
笔者对宁夏中卫沙坡头干旱区沙漠表面结皮中藻类进行了为时１０个月（１９９１年５月－１９９２年２月）的定量和定性研究、结果表明：共出现１３个属的藻类，其中蓝藻５属，绿藻６属（包括１个未鉴定出的属），硅藻２属。运用稀释平板法得到藻类生物量平均为８．１１７×１０￣４ｃｅｌｌｓ／ｇ Ｄ．Ｓ．根据结皮土壤的理化性质（包括ｐＨ、含水量、电导率、水溶性Ｋ￣＋、Ｎａ￣＋、Ｃａ￣（２＋）和Ｍｇ￣（２＋）的量、交换性盐基总量、全磷量、有机质和凯氏氮）及气候条件（气温、降雨量和土壤温度）分别与藻类生物量的简单相关系数可知影响生物量比较显著的因子有交换性盐基总量（ｒ＝０．６８３）、降雨量（ｒ＝０．７１２）、有机质含量（ｒ＝０．５８４）和水溶性Ｎａ￣＋（ｒ＝０．５８６）。进一步运用逐步回归分析的方法，结果表明影响藻类生物量最显著的相关因子是水溶性Ｍｇ￣（２＋）和降雨量（Ｒ￣２＝７８．７４％）。
oil algae in surface crust of desert in Shapotou were identified and studied over a 10-month period(from May 1991 to February 1992 ). The results showed that 5 genera ofCyanophyta, 6 genera of Chlorophyta and 2 genera of Bacillariophyta occurred at this site. The average algal biomass in soil was 8. 117×10￣4 cells/g dry soi. Meanwhile, the physicaland chemical properties of soil in crust were analysed, which included pH, water- soluablecations(K￣+, Na￣+, Ca￣(2+), Mg￣(2+)). moisture ,electric conductivity, exchageable salts, phospho-rus,organic matter and Kjeldahl nitrogen .Regarding these properties and other three climatic factors(i.e. air temperature. soil temperature and precipitation)as independent variables.weworked out the coefficient of correlation between each of them and the biomass. According tothe results,the more significant factors affecting the algal biomass were exchangeable salts(r=0. 683),precipitation(r=0. 712),water-soluable Na￣+(r=0. 586) and organic matter(r=0. 584). In terms of the further study of the multiple regression equation obtained ,the moresignificant factors showing a relationship with algal biomass were water- soluble Mg￣(2+) andprecipitation,R￣2=78. 74%.
出处
《生态学报》
CAS
CSCD
北大核心
1995年第4期385-391,共7页
Acta Ecologica Sinica
关键词
藻类
生态学
沙漠结皮
ecology,soil algae,desert crust,algal biomass.
